The blonde beauty, who split with the Prince back in 2010, arrived to watch the prestigious Cartier Queen's Cup Polo at the at Guards Polo Club in Windsor with a group of friends.
Dressing for summer, Chelsy Davy chose a pretty blue summer dress and snakeskin wedges heels and Rayban sunnies for the posh outing.
But Prince Harry, who reportedly still holds a candle for his South African ex-girlfriend, was nowhere to be seen.
Royal ex Chelsy Davy mingled with a host of celebs in the exclusive enclosure at the polo club.
Also in attendance were Dita Von Teese, Burberry boy Douglas both, Kaya Scodelario and Elliott Tittensor, and Made in Chelsea star Hugo Taylor.
He may not have been in attendance on the day, but Prince Harry still managed to get his polo fix during the weekend.
Harry joined Prince William, Kate Middleton and their new puppy Lupo at a charity match at Beaufort Polo club on Sunday.
Would you like to see Prince Harry and Chelsy Davy reunite? Let us know in the comments box below...